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Moving Charges and Magnetism · Question 38

AIPMT 2015 (Cancelled)MCQHard📈 Topic in 62% papers+4−1
1

A wire carrying current I has the shape shown in adjoining figure. [figure] Linear parts of the wire are very long and parallel to X-axis while semicircular portion of radius R is lying in Y-Z plane. Magnetic field at point O is

  1. B = - 0 I4 R ( i + 2 k )
  2. B = 0 I4 R ( i - 2 k )
  3. B = 0 I4 R ( i + 2 k )
  4. B = - 0 I4 R ( i - 2 k )

Answer

(1) B = - 0 I4 R ( i + 2 k )

Solution

Current enters along the wire at y = −R (flowing towards −x), goes round the semicircle and leaves along the wire at y = +R (flowing towards +x).

Each semi-infinite wire (O at perpendicular distance R from it, at its end): B1 = B2 = 0 I4 R

By the right-hand rule both are along - k B1 + B2 = - 0 I4 R(2 k)

Semicircle (in the Y-Z plane): B3 = 0 I4R = 0 I4 R , perpendicular to its plane, along - i

B = - 0 I4 R ( i + 2 k )

Answer: (1)

AIPMT 2015 (Cancelled)

Keep practising — Moving Charges and Magnetism

2

In an ammeter 0.2% of main current passes through the galvanometer. If resistance of galvanometer is G, the resistance of ammeter will be

  1. 1499 G
  2. 499500 G
  3. 1500 G
  4. 500499 G
AIPMT 2014
3

Two identical long conducting wires AOB and COD are placed at right angle to each other, with one above other such that O is their common point for the two. The wires carry I1 and I2 currents, respectively. Point P is lying at distance d from O along a direction perpendicular to the plane containing the wires. The magnetic field at the point P will be

  1. 02 d ( I1I2 )
  2. 02 d (I1 + I2 )
  3. 02 d (I12 - I22 )
  4. 02 d (I12 + I22 )1/2
AIPMT 2014
4

When a proton is released from rest in a room, it starts with an initial acceleration a0 towards west. When it is projected towards north with a speed v0 it moves with an initial acceleration 3a0 towards west. The electric and magnetic fields in the room are

  1. ma0e east, 3ma0ev0 up
  2. ma0e east, 3ma0ev0 down
  3. ma0e west, 2ma0ev0 up
  4. ma0e west, 2ma0ev0 down
NEET 2013
5

A current loop in a magnetic field

  1. can be in equilibrium in two orientations, both the equilibrium states are unstable.
  2. can be in equilibrium in two orientations, one stable while the other is unstable.
  3. experiences a torque whether the field is uniform or non uniform in all orientations.
  4. can be in equilibrium in one orientation.
NEET 2013
6

A long straight wire carries a certain current and produces a magnetic field 2 10-4 Wb m-2 at a perpendicular distance of 5 cm from the wire. An electron situated at 5 cm from the wire moves with a velocity 107 m/s towards the wire along perpendicular to it. The force experienced by the electron will be (charge on electron 1.6 10-19 C)

  1. 3.2 N
  2. 3.2 10-16 N
  3. 1.6 10-16 N
  4. zero
NEET 2013 (Karnataka)
7

A circular coil ABCD carrying a current 'i' is placed in a uniform magnetic field. If the magnetic force on the segment AB is F, the force on the remaining segment BCDA is [figure]

  1. - F
  2. 3 F
  3. -3 F
  4. F
NEET 2013 (Karnataka)
8

A proton carrying 1 MeV kinetic energy is moving in a circular path of radius R in uniform magnetic field. What should be the energy of an -particle to describe a circle of same radius in the same field?

  1. 2 MeV
  2. 1 MeV
  3. 0.5 MeV
  4. 4 MeV
AIPMT 2012 (Mains)
9

Two similar coils of radius R are lying concentrically with their planes at right angles to each other. The currents flowing in them are I and 2I, respectively. The resultant magnetic field induction at the centre will be

  1. 5 0I2R
  2. 5 0IR
  3. 0I2R
  4. 0IR
AIPMT 2012 (Prelims)
10

A millivoltmeter of 25 millivolt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be

  1. 0.001
  2. 0.01
  3. 1
  4. 0.05
AIPMT 2012 (Prelims)
11

An alternating electric field, of frequency , is applied across the dees (radius = R) of a cyclotron that is being used to accelerate protons (mass = m). The operating magnetic field (B) used in the cyclotron and the kinetic energy (K) of the proton beam, produced by it, are given by

  1. B = m e and K = 2m 2 2R2
  2. B = 2 e and K = m2 2
  3. B = 2 e and K = 2m 2 2R2
  4. B = m e and K = m2 2
AIPMT 2012 (Prelims)

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